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arXiv 1002.0014astro-ph.CO
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空洞作为暗能量的精确探针

Voids as a Precision Probe of Dark Energy

Rahul Biswas, Esfandiar Alizadeh, Benjamin D. Wandelt

摘要:

可以在空隙的形状中观察到暗能量状态方程的特征。我们估计宇宙学参数的约束,将确定从未来的光谱调查已经计划用于大尺度结构的研究的空隙的椭圆率分布。这些限制来自于椭圆率分布对宇宙学参数的敏感性,通过在一定长度尺度上平滑的密度场的波动方差。这个长度尺度可以被选择为当波动是高斯分布时在非常早的时间的空隙的共动半径的数量级。我们使用Fisher估计表明,从空椭圆的约束是有前途的。将这些约束与其他传统方法相结合,可以使暗能量工作组的暗能量参数的品质因数提高数百个数量级,以便将来进行实验。这些未来的制约因素的估计取决于一些系统性的问题,需要进一步研究使用模拟。我们概述了这些问题和研究的影响,某些观测和理论系统的预测约束暗能量参数。

英文摘要:

A signature of the dark energy equation of state may be observed in the shape of voids. We estimate the constraints on cosmological parameters that would be determined from the ellipticity distribution of voids from future spectroscopic surveys already planned for the study of large scale structure. The constraints stem from the sensitivity of the distribution of ellipticity to the cosmological parameters through the variance of fluctuations of the density field smoothed at some length scale. This length scale can be chosen to be of the order of the comoving radii of voids at very early times when the fluctuations are Gaussian distributed. We use Fisher estimates to show that the constraints from void ellipticities are promising. Combining these constraints with other traditional methods results in the improvement of the Dark Energy Task Force Figure of Merit on the dark energy parameters by an order of hundred for future experiments. The estimates of these future constraints depend on a number of systematic issues which require further study using simulations. We outline these issues and study the impact of certain observational and theoretical systematics on the forecasted constraints on dark energy parameters.

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